1 /* $OpenBSD: auth.c,v 1.111 2015/05/01 04:17:51 djm Exp $ */ 2 /* 3 * Copyright (c) 2000 Markus Friedl. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "includes.h" 27 __RCSID("$FreeBSD$"); 28 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 32 #include <netinet/in.h> 33 34 #include <errno.h> 35 #include <fcntl.h> 36 #ifdef HAVE_PATHS_H 37 # include <paths.h> 38 #endif 39 #include <pwd.h> 40 #ifdef HAVE_LOGIN_H 41 #include <login.h> 42 #endif 43 #ifdef USE_SHADOW 44 #include <shadow.h> 45 #endif 46 #ifdef HAVE_LIBGEN_H 47 #include <libgen.h> 48 #endif 49 #include <stdarg.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include <limits.h> 54 55 #include "xmalloc.h" 56 #include "match.h" 57 #include "groupaccess.h" 58 #include "log.h" 59 #include "buffer.h" 60 #include "misc.h" 61 #include "servconf.h" 62 #include "key.h" 63 #include "hostfile.h" 64 #include "auth.h" 65 #include "auth-options.h" 66 #include "canohost.h" 67 #include "uidswap.h" 68 #include "packet.h" 69 #include "loginrec.h" 70 #ifdef GSSAPI 71 #include "ssh-gss.h" 72 #endif 73 #include "authfile.h" 74 #include "monitor_wrap.h" 75 #include "authfile.h" 76 #include "ssherr.h" 77 #include "compat.h" 78 79 /* import */ 80 extern ServerOptions options; 81 extern int use_privsep; 82 extern Buffer loginmsg; 83 extern struct passwd *privsep_pw; 84 85 /* Debugging messages */ 86 Buffer auth_debug; 87 int auth_debug_init; 88 89 /* 90 * Check if the user is allowed to log in via ssh. If user is listed 91 * in DenyUsers or one of user's groups is listed in DenyGroups, false 92 * will be returned. If AllowUsers isn't empty and user isn't listed 93 * there, or if AllowGroups isn't empty and one of user's groups isn't 94 * listed there, false will be returned. 95 * If the user's shell is not executable, false will be returned. 96 * Otherwise true is returned. 97 */ 98 int 99 allowed_user(struct passwd * pw) 100 { 101 struct stat st; 102 const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; 103 u_int i; 104 #ifdef USE_SHADOW 105 struct spwd *spw = NULL; 106 #endif 107 108 /* Shouldn't be called if pw is NULL, but better safe than sorry... */ 109 if (!pw || !pw->pw_name) 110 return 0; 111 112 #ifdef USE_SHADOW 113 if (!options.use_pam) 114 spw = getspnam(pw->pw_name); 115 #ifdef HAS_SHADOW_EXPIRE 116 if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) 117 return 0; 118 #endif /* HAS_SHADOW_EXPIRE */ 119 #endif /* USE_SHADOW */ 120 121 /* grab passwd field for locked account check */ 122 passwd = pw->pw_passwd; 123 #ifdef USE_SHADOW 124 if (spw != NULL) 125 #ifdef USE_LIBIAF 126 passwd = get_iaf_password(pw); 127 #else 128 passwd = spw->sp_pwdp; 129 #endif /* USE_LIBIAF */ 130 #endif 131 132 /* check for locked account */ 133 if (!options.use_pam && passwd && *passwd) { 134 int locked = 0; 135 136 #ifdef LOCKED_PASSWD_STRING 137 if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) 138 locked = 1; 139 #endif 140 #ifdef LOCKED_PASSWD_PREFIX 141 if (strncmp(passwd, LOCKED_PASSWD_PREFIX, 142 strlen(LOCKED_PASSWD_PREFIX)) == 0) 143 locked = 1; 144 #endif 145 #ifdef LOCKED_PASSWD_SUBSTR 146 if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) 147 locked = 1; 148 #endif 149 #ifdef USE_LIBIAF 150 free((void *) passwd); 151 #endif /* USE_LIBIAF */ 152 if (locked) { 153 logit("User %.100s not allowed because account is locked", 154 pw->pw_name); 155 return 0; 156 } 157 } 158 159 /* 160 * Deny if shell does not exist or is not executable unless we 161 * are chrooting. 162 */ 163 if (options.chroot_directory == NULL || 164 strcasecmp(options.chroot_directory, "none") == 0) { 165 char *shell = xstrdup((pw->pw_shell[0] == '\0') ? 166 _PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */ 167 168 if (stat(shell, &st) != 0) { 169 logit("User %.100s not allowed because shell %.100s " 170 "does not exist", pw->pw_name, shell); 171 free(shell); 172 return 0; 173 } 174 if (S_ISREG(st.st_mode) == 0 || 175 (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { 176 logit("User %.100s not allowed because shell %.100s " 177 "is not executable", pw->pw_name, shell); 178 free(shell); 179 return 0; 180 } 181 free(shell); 182 } 183 184 if (options.num_deny_users > 0 || options.num_allow_users > 0 || 185 options.num_deny_groups > 0 || options.num_allow_groups > 0) { 186 hostname = get_canonical_hostname(options.use_dns); 187 ipaddr = get_remote_ipaddr(); 188 } 189 190 /* Return false if user is listed in DenyUsers */ 191 if (options.num_deny_users > 0) { 192 for (i = 0; i < options.num_deny_users; i++) 193 if (match_user(pw->pw_name, hostname, ipaddr, 194 options.deny_users[i])) { 195 logit("User %.100s from %.100s not allowed " 196 "because listed in DenyUsers", 197 pw->pw_name, hostname); 198 return 0; 199 } 200 } 201 /* Return false if AllowUsers isn't empty and user isn't listed there */ 202 if (options.num_allow_users > 0) { 203 for (i = 0; i < options.num_allow_users; i++) 204 if (match_user(pw->pw_name, hostname, ipaddr, 205 options.allow_users[i])) 206 break; 207 /* i < options.num_allow_users iff we break for loop */ 208 if (i >= options.num_allow_users) { 209 logit("User %.100s from %.100s not allowed because " 210 "not listed in AllowUsers", pw->pw_name, hostname); 211 return 0; 212 } 213 } 214 if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { 215 /* Get the user's group access list (primary and supplementary) */ 216 if (ga_init(pw->pw_name, pw->pw_gid) == 0) { 217 logit("User %.100s from %.100s not allowed because " 218 "not in any group", pw->pw_name, hostname); 219 return 0; 220 } 221 222 /* Return false if one of user's groups is listed in DenyGroups */ 223 if (options.num_deny_groups > 0) 224 if (ga_match(options.deny_groups, 225 options.num_deny_groups)) { 226 ga_free(); 227 logit("User %.100s from %.100s not allowed " 228 "because a group is listed in DenyGroups", 229 pw->pw_name, hostname); 230 return 0; 231 } 232 /* 233 * Return false if AllowGroups isn't empty and one of user's groups 234 * isn't listed there 235 */ 236 if (options.num_allow_groups > 0) 237 if (!ga_match(options.allow_groups, 238 options.num_allow_groups)) { 239 ga_free(); 240 logit("User %.100s from %.100s not allowed " 241 "because none of user's groups are listed " 242 "in AllowGroups", pw->pw_name, hostname); 243 return 0; 244 } 245 ga_free(); 246 } 247 248 #ifdef CUSTOM_SYS_AUTH_ALLOWED_USER 249 if (!sys_auth_allowed_user(pw, &loginmsg)) 250 return 0; 251 #endif 252 253 /* We found no reason not to let this user try to log on... */ 254 return 1; 255 } 256 257 void 258 auth_info(Authctxt *authctxt, const char *fmt, ...) 259 { 260 va_list ap; 261 int i; 262 263 free(authctxt->info); 264 authctxt->info = NULL; 265 266 va_start(ap, fmt); 267 i = vasprintf(&authctxt->info, fmt, ap); 268 va_end(ap); 269 270 if (i < 0 || authctxt->info == NULL) 271 fatal("vasprintf failed"); 272 } 273 274 void 275 auth_log(Authctxt *authctxt, int authenticated, int partial, 276 const char *method, const char *submethod) 277 { 278 void (*authlog) (const char *fmt,...) = verbose; 279 char *authmsg; 280 281 if (use_privsep && !mm_is_monitor() && !authctxt->postponed) 282 return; 283 284 /* Raise logging level */ 285 if (authenticated == 1 || 286 !authctxt->valid || 287 authctxt->failures >= options.max_authtries / 2 || 288 strcmp(method, "password") == 0) 289 authlog = logit; 290 291 if (authctxt->postponed) 292 authmsg = "Postponed"; 293 else if (partial) 294 authmsg = "Partial"; 295 else 296 authmsg = authenticated ? "Accepted" : "Failed"; 297 298 authlog("%s %s%s%s for %s%.100s from %.200s port %d %s%s%s", 299 authmsg, 300 method, 301 submethod != NULL ? "/" : "", submethod == NULL ? "" : submethod, 302 authctxt->valid ? "" : "invalid user ", 303 authctxt->user, 304 get_remote_ipaddr(), 305 get_remote_port(), 306 compat20 ? "ssh2" : "ssh1", 307 authctxt->info != NULL ? ": " : "", 308 authctxt->info != NULL ? authctxt->info : ""); 309 free(authctxt->info); 310 authctxt->info = NULL; 311 312 #ifdef CUSTOM_FAILED_LOGIN 313 if (authenticated == 0 && !authctxt->postponed && 314 (strcmp(method, "password") == 0 || 315 strncmp(method, "keyboard-interactive", 20) == 0 || 316 strcmp(method, "challenge-response") == 0)) 317 record_failed_login(authctxt->user, 318 get_canonical_hostname(options.use_dns), "ssh"); 319 # ifdef WITH_AIXAUTHENTICATE 320 if (authenticated) 321 sys_auth_record_login(authctxt->user, 322 get_canonical_hostname(options.use_dns), "ssh", &loginmsg); 323 # endif 324 #endif 325 #ifdef SSH_AUDIT_EVENTS 326 if (authenticated == 0 && !authctxt->postponed) 327 audit_event(audit_classify_auth(method)); 328 #endif 329 } 330 331 332 void 333 auth_maxtries_exceeded(Authctxt *authctxt) 334 { 335 error("maximum authentication attempts exceeded for " 336 "%s%.100s from %.200s port %d %s", 337 authctxt->valid ? "" : "invalid user ", 338 authctxt->user, 339 get_remote_ipaddr(), 340 get_remote_port(), 341 compat20 ? "ssh2" : "ssh1"); 342 packet_disconnect("Too many authentication failures"); 343 /* NOTREACHED */ 344 } 345 346 /* 347 * Check whether root logins are disallowed. 348 */ 349 int 350 auth_root_allowed(const char *method) 351 { 352 switch (options.permit_root_login) { 353 case PERMIT_YES: 354 return 1; 355 case PERMIT_NO_PASSWD: 356 if (strcmp(method, "password") != 0) 357 return 1; 358 break; 359 case PERMIT_FORCED_ONLY: 360 if (forced_command) { 361 logit("Root login accepted for forced command."); 362 return 1; 363 } 364 break; 365 } 366 logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); 367 return 0; 368 } 369 370 371 /* 372 * Given a template and a passwd structure, build a filename 373 * by substituting % tokenised options. Currently, %% becomes '%', 374 * %h becomes the home directory and %u the username. 375 * 376 * This returns a buffer allocated by xmalloc. 377 */ 378 char * 379 expand_authorized_keys(const char *filename, struct passwd *pw) 380 { 381 char *file, ret[PATH_MAX]; 382 int i; 383 384 file = percent_expand(filename, "h", pw->pw_dir, 385 "u", pw->pw_name, (char *)NULL); 386 387 /* 388 * Ensure that filename starts anchored. If not, be backward 389 * compatible and prepend the '%h/' 390 */ 391 if (*file == '/') 392 return (file); 393 394 i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); 395 if (i < 0 || (size_t)i >= sizeof(ret)) 396 fatal("expand_authorized_keys: path too long"); 397 free(file); 398 return (xstrdup(ret)); 399 } 400 401 char * 402 authorized_principals_file(struct passwd *pw) 403 { 404 if (options.authorized_principals_file == NULL) 405 return NULL; 406 return expand_authorized_keys(options.authorized_principals_file, pw); 407 } 408 409 /* return ok if key exists in sysfile or userfile */ 410 HostStatus 411 check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, 412 const char *sysfile, const char *userfile) 413 { 414 char *user_hostfile; 415 struct stat st; 416 HostStatus host_status; 417 struct hostkeys *hostkeys; 418 const struct hostkey_entry *found; 419 420 hostkeys = init_hostkeys(); 421 load_hostkeys(hostkeys, host, sysfile); 422 if (userfile != NULL) { 423 user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); 424 if (options.strict_modes && 425 (stat(user_hostfile, &st) == 0) && 426 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || 427 (st.st_mode & 022) != 0)) { 428 logit("Authentication refused for %.100s: " 429 "bad owner or modes for %.200s", 430 pw->pw_name, user_hostfile); 431 auth_debug_add("Ignored %.200s: bad ownership or modes", 432 user_hostfile); 433 } else { 434 temporarily_use_uid(pw); 435 load_hostkeys(hostkeys, host, user_hostfile); 436 restore_uid(); 437 } 438 free(user_hostfile); 439 } 440 host_status = check_key_in_hostkeys(hostkeys, key, &found); 441 if (host_status == HOST_REVOKED) 442 error("WARNING: revoked key for %s attempted authentication", 443 found->host); 444 else if (host_status == HOST_OK) 445 debug("%s: key for %s found at %s:%ld", __func__, 446 found->host, found->file, found->line); 447 else 448 debug("%s: key for host %s not found", __func__, host); 449 450 free_hostkeys(hostkeys); 451 452 return host_status; 453 } 454 455 /* 456 * Check a given path for security. This is defined as all components 457 * of the path to the file must be owned by either the owner of 458 * of the file or root and no directories must be group or world writable. 459 * 460 * XXX Should any specific check be done for sym links ? 461 * 462 * Takes a file name, its stat information (preferably from fstat() to 463 * avoid races), the uid of the expected owner, their home directory and an 464 * error buffer plus max size as arguments. 465 * 466 * Returns 0 on success and -1 on failure 467 */ 468 int 469 auth_secure_path(const char *name, struct stat *stp, const char *pw_dir, 470 uid_t uid, char *err, size_t errlen) 471 { 472 char buf[PATH_MAX], homedir[PATH_MAX]; 473 char *cp; 474 int comparehome = 0; 475 struct stat st; 476 477 if (realpath(name, buf) == NULL) { 478 snprintf(err, errlen, "realpath %s failed: %s", name, 479 strerror(errno)); 480 return -1; 481 } 482 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 483 comparehome = 1; 484 485 if (!S_ISREG(stp->st_mode)) { 486 snprintf(err, errlen, "%s is not a regular file", buf); 487 return -1; 488 } 489 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || 490 (stp->st_mode & 022) != 0) { 491 snprintf(err, errlen, "bad ownership or modes for file %s", 492 buf); 493 return -1; 494 } 495 496 /* for each component of the canonical path, walking upwards */ 497 for (;;) { 498 if ((cp = dirname(buf)) == NULL) { 499 snprintf(err, errlen, "dirname() failed"); 500 return -1; 501 } 502 strlcpy(buf, cp, sizeof(buf)); 503 504 if (stat(buf, &st) < 0 || 505 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || 506 (st.st_mode & 022) != 0) { 507 snprintf(err, errlen, 508 "bad ownership or modes for directory %s", buf); 509 return -1; 510 } 511 512 /* If are past the homedir then we can stop */ 513 if (comparehome && strcmp(homedir, buf) == 0) 514 break; 515 516 /* 517 * dirname should always complete with a "/" path, 518 * but we can be paranoid and check for "." too 519 */ 520 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 521 break; 522 } 523 return 0; 524 } 525 526 /* 527 * Version of secure_path() that accepts an open file descriptor to 528 * avoid races. 529 * 530 * Returns 0 on success and -1 on failure 531 */ 532 static int 533 secure_filename(FILE *f, const char *file, struct passwd *pw, 534 char *err, size_t errlen) 535 { 536 struct stat st; 537 538 /* check the open file to avoid races */ 539 if (fstat(fileno(f), &st) < 0) { 540 snprintf(err, errlen, "cannot stat file %s: %s", 541 file, strerror(errno)); 542 return -1; 543 } 544 return auth_secure_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 545 } 546 547 static FILE * 548 auth_openfile(const char *file, struct passwd *pw, int strict_modes, 549 int log_missing, char *file_type) 550 { 551 char line[1024]; 552 struct stat st; 553 int fd; 554 FILE *f; 555 556 if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) { 557 if (log_missing || errno != ENOENT) 558 debug("Could not open %s '%s': %s", file_type, file, 559 strerror(errno)); 560 return NULL; 561 } 562 563 if (fstat(fd, &st) < 0) { 564 close(fd); 565 return NULL; 566 } 567 if (!S_ISREG(st.st_mode)) { 568 logit("User %s %s %s is not a regular file", 569 pw->pw_name, file_type, file); 570 close(fd); 571 return NULL; 572 } 573 unset_nonblock(fd); 574 if ((f = fdopen(fd, "r")) == NULL) { 575 close(fd); 576 return NULL; 577 } 578 if (strict_modes && 579 secure_filename(f, file, pw, line, sizeof(line)) != 0) { 580 fclose(f); 581 logit("Authentication refused: %s", line); 582 auth_debug_add("Ignored %s: %s", file_type, line); 583 return NULL; 584 } 585 586 return f; 587 } 588 589 590 FILE * 591 auth_openkeyfile(const char *file, struct passwd *pw, int strict_modes) 592 { 593 return auth_openfile(file, pw, strict_modes, 1, "authorized keys"); 594 } 595 596 FILE * 597 auth_openprincipals(const char *file, struct passwd *pw, int strict_modes) 598 { 599 return auth_openfile(file, pw, strict_modes, 0, 600 "authorized principals"); 601 } 602 603 struct passwd * 604 getpwnamallow(const char *user) 605 { 606 #ifdef HAVE_LOGIN_CAP 607 extern login_cap_t *lc; 608 #ifdef BSD_AUTH 609 auth_session_t *as; 610 #endif 611 #endif 612 struct passwd *pw; 613 struct connection_info *ci = get_connection_info(1, options.use_dns); 614 615 ci->user = user; 616 parse_server_match_config(&options, ci); 617 618 #if defined(_AIX) && defined(HAVE_SETAUTHDB) 619 aix_setauthdb(user); 620 #endif 621 622 pw = getpwnam(user); 623 624 #if defined(_AIX) && defined(HAVE_SETAUTHDB) 625 aix_restoreauthdb(); 626 #endif 627 #ifdef HAVE_CYGWIN 628 /* 629 * Windows usernames are case-insensitive. To avoid later problems 630 * when trying to match the username, the user is only allowed to 631 * login if the username is given in the same case as stored in the 632 * user database. 633 */ 634 if (pw != NULL && strcmp(user, pw->pw_name) != 0) { 635 logit("Login name %.100s does not match stored username %.100s", 636 user, pw->pw_name); 637 pw = NULL; 638 } 639 #endif 640 if (pw == NULL) { 641 logit("Invalid user %.100s from %.100s", 642 user, get_remote_ipaddr()); 643 #ifdef CUSTOM_FAILED_LOGIN 644 record_failed_login(user, 645 get_canonical_hostname(options.use_dns), "ssh"); 646 #endif 647 #ifdef SSH_AUDIT_EVENTS 648 audit_event(SSH_INVALID_USER); 649 #endif /* SSH_AUDIT_EVENTS */ 650 return (NULL); 651 } 652 if (!allowed_user(pw)) 653 return (NULL); 654 #ifdef HAVE_LOGIN_CAP 655 if ((lc = login_getpwclass(pw)) == NULL) { 656 debug("unable to get login class: %s", user); 657 return (NULL); 658 } 659 #ifdef BSD_AUTH 660 if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || 661 auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { 662 debug("Approval failure for %s", user); 663 pw = NULL; 664 } 665 if (as != NULL) 666 auth_close(as); 667 #endif 668 #endif 669 if (pw != NULL) 670 return (pwcopy(pw)); 671 return (NULL); 672 } 673 674 /* Returns 1 if key is revoked by revoked_keys_file, 0 otherwise */ 675 int 676 auth_key_is_revoked(Key *key) 677 { 678 char *fp = NULL; 679 int r; 680 681 if (options.revoked_keys_file == NULL) 682 return 0; 683 if ((fp = sshkey_fingerprint(key, options.fingerprint_hash, 684 SSH_FP_DEFAULT)) == NULL) { 685 r = SSH_ERR_ALLOC_FAIL; 686 error("%s: fingerprint key: %s", __func__, ssh_err(r)); 687 goto out; 688 } 689 690 r = sshkey_check_revoked(key, options.revoked_keys_file); 691 switch (r) { 692 case 0: 693 break; /* not revoked */ 694 case SSH_ERR_KEY_REVOKED: 695 error("Authentication key %s %s revoked by file %s", 696 sshkey_type(key), fp, options.revoked_keys_file); 697 goto out; 698 default: 699 error("Error checking authentication key %s %s in " 700 "revoked keys file %s: %s", sshkey_type(key), fp, 701 options.revoked_keys_file, ssh_err(r)); 702 goto out; 703 } 704 705 /* Success */ 706 r = 0; 707 708 out: 709 free(fp); 710 return r == 0 ? 0 : 1; 711 } 712 713 void 714 auth_debug_add(const char *fmt,...) 715 { 716 char buf[1024]; 717 va_list args; 718 719 if (!auth_debug_init) 720 return; 721 722 va_start(args, fmt); 723 vsnprintf(buf, sizeof(buf), fmt, args); 724 va_end(args); 725 buffer_put_cstring(&auth_debug, buf); 726 } 727 728 void 729 auth_debug_send(void) 730 { 731 char *msg; 732 733 if (!auth_debug_init) 734 return; 735 while (buffer_len(&auth_debug)) { 736 msg = buffer_get_string(&auth_debug, NULL); 737 packet_send_debug("%s", msg); 738 free(msg); 739 } 740 } 741 742 void 743 auth_debug_reset(void) 744 { 745 if (auth_debug_init) 746 buffer_clear(&auth_debug); 747 else { 748 buffer_init(&auth_debug); 749 auth_debug_init = 1; 750 } 751 } 752 753 struct passwd * 754 fakepw(void) 755 { 756 static struct passwd fake; 757 758 memset(&fake, 0, sizeof(fake)); 759 fake.pw_name = "NOUSER"; 760 fake.pw_passwd = 761 "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; 762 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 763 fake.pw_gecos = "NOUSER"; 764 #endif 765 fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid; 766 fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid; 767 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 768 fake.pw_class = ""; 769 #endif 770 fake.pw_dir = "/nonexist"; 771 fake.pw_shell = "/nonexist"; 772 773 return (&fake); 774 } 775